Just look at Ampeg, they have there classic tube 300w on some of the same stages as there SVT4PRO 1600w!
They don't make em like they used to. :-(
And by the way, I've not owned a shuttle yet but I'm working on it. I bought a RH450 and loved the features besides the tubetone (very poor). But I thought the bottom end is very poor quality and sounds broken up the further you stand from it. I use a wireless and like to hear the sound from the crowd in sound check. And when I'm 5-10 feet from it I love it but IMO it falls apart in distance. Markbass is where the best low end is at IMO. But Ive really got gas for the 9.0 now so I'll tell you what I think when I get ahold of one.
Don't shoot me RH450 Users, I like the LED lights.